Can't delete or overwrite saves (steam)

I'm playing on PC on Steam, and I'm having an issue where I cannot delete or overwrite my save files. Every time I try overwriting a save, the game makes a duplicate save with the same name as the one I'm trying to overwrite instead. If I try to delete a save, I go through the process and confirm I want to delete it, but the save does not disappear. 

I'm someone who likes to constantly save my game and I tend to have 1 main file I use that I overwrite frequently, and then make additional saves for specific moments I want to have separate. Because of the duplicating and being unable to delete saves, I now have 15 save files when I really should have 3 or 4. 

I've tried verifying my game files but I cannot think of anything else to try and fix it. I haven't seen anyone else have this issue. I included a clip of what happens when I try to delete files.